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Old 11-06-2010, 05:32 PM   #1 (permalink)
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Join Date: Nov 2010
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Hi from the Mile High City!

Greetings, ecomodders. Since I'm sure everyone here loves numbers and specs, let me just cut to the chase.

Manual 1997 TJ Jeep Wrangler SE, 2.5l 4 cylinder AMC engine. Sitting on 31" BFG AT tires (at 30 PSI), and stock suspension height.

Averaging about 290 miles per 15 gallons, or 19.33 MPG. My calculation method is a little weird, but I'm pretty sure its consistent. I hit the tripometer the moment my low-fuel light comes on, and add exactly 15 gallons ASAP. I then drive until the light comes on again, and see what the tripometer says, before resetting it and repeating.

I do this because some Jeep TJs (like mine) have problems with the anti-fuel-spill valve. I can't "fill my tank" without either overfilling it, or having the pump stop long before the tank is truly full. The only way to consistently add fuel is to do so manually.

I do a little bit of mild PNGing, keep the speedo under 60, engine-off at long lights, and DWB in town.

I have done zero modifications beyond adding 10W-30 synthetic oil 100 miles ago (no noticeable MPG improvement). I'm at 118,000 miles. I have no MPG gauges. I use grade-85 octane fuel, due to the altitude.

I'm here because I want to improve my MPG by 10%. I want to get at least 300 miles per 15 gallon fillup, consistently. Maybe you guys can help me?

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Old 11-06-2010, 05:46 PM   #2 (permalink)
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Welcome.
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Old 11-06-2010, 07:49 PM   #3 (permalink)
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Join Date: Sep 2010
Location: Foothills near Denver
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RSX2fast4mpg - '02 Acura RSX Type S
90 day: 38.22 mpg (US)

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Welcome. I'm on the west side of town (Morrison).

As winter approaches, good mileage just gets tougher due to poor traction, the change in fuels, and cold engines are simply less efficient. Consider adding a block heater to combat the dreaded low mileage that comes with cold starts.

Consider an MPG meter like an Ultragauge or Scangauge. For most drivers, they'll pay for themselves in saved fuel in 3-6 months by teaching you to change the little things.
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Old 11-07-2010, 05:35 AM   #4 (permalink)
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Vegan Powa! - '91 Honda CRX DX
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Welcome! There are plenty of other Jeeps on the site, so you're in good company.

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